Experiments with extra cuttings are fun! Good luck with your project. I hope they are in partial shade. Baby figs aren't happy with full sun. I don't use cans in my fig nursery. Just lay them horizontal in a shallow trench. Only problem with my way is the roots form at one end, go deep into the ground, and the tree emerges at the other and when I try to pot them up, the cutting is still horizontal and I can't get the tree in the middle of the 5 gallon pot. BUT, oh well.
I'm excited more about my under boulder experiment at the moment.
Let us know when they show progress!
Suzi